BA cancelled flight from T5 at 8pm the day before and rebooked a flight for same day but 2 hours earlier from T2. Arrived early at T5 for parking but told no transportation between T5 and T2 until 5am (our flight was at 6.30) attended said best option was to drive to T2 level 1 and park there. Drove to T2 but charged £7.50 to exit T5. Got to T2 level 1 where office was closed but a telephone number to ring for help, after multiple attempts got through to someone who told us to go to level 4. Was charged a further £17.40 to exit T2 level one get to level 4 and then drop of car. Not impressed